National Medical Journal of China, Volume 99, Issue 15,2019, Pages 1147-1151, doi:10.3760/cma.j.issn.0376-2491.2019.15.006
National Medical Journal of China, Volume 99, Issue 15,2019, Pages 1123-1132, doi:10.3760/cma.j.issn.0376-2491.2019.15.002
National Medical Journal of China, Volume 99, Issue 15,2019, Pages 1162-1166, doi:10.3760/cma.j.issn.0376-2491.2019.15.009
National Medical Journal of China, Volume 99, Issue 15,2019, Pages 1142-1146, doi:10.3760/cma.j.issn.0376-2491.2019.15.005
National Medical Journal of China, Volume 99, Issue 15,2019, Pages 1172-1177, doi:10.3760/cma.j.issn.0376-2491.2019.15.011